You may want to try a multi-mineral if you can not find zinc alone. Lindberg carries a product called Blue Bonnet High Potency Chelated Multiminerals that I find is helpful in many ways. From what I have read it is more advisable to take a balanced approach to supplements rather than take too much of one thing. This multimineral also has the copper to balance out the zinc.
I have ordered Vitamin D and Zinc-Copper from online retailer iHerb. Free shipping on orders over $20 and both are in stock. A good variety of vitamins at decent prices.
Senti, the original youtube video on that Shanghai doctor describing a patient being treated by intravenous Vit. C was taken down because too many Covid cure/treatments were being circulated on the net. However there seems to be a basis for using Vit.C in the treatment of the virus and is being studied.
Could vitamin C help cure COVID-19? A Canadian trial hopes to find out Could infusions of the nutrient curb the death toll from out-of-control infections triggered by COVID-19?